Refractory substance.



UNITED STATES PATENT OFFICE.

FRIEDRICH GROSSMANN, OF KCNIG SWIN'IER, GERMANY, ASSIGNOR T0 HEINRICHSCHMITS, OF HERNE, GERMANY.

REFRACTORY SUBSTANCE.

No Drawing.

To all whom it may concern: I

Be it known that I, FRIEDRICH GRoss- MANN, a subject of the GermanEmperor, residing at Konigswinter, Germany, have invented a new anduseful Refractory Substance, of which the following is a specification.

The subject of the present invention is a substance which is suitablefor use as a refractory material. In particular the material can beadvantageously used to make crucibles, fireproof bricks for liningfurnaces of all kinds, and even fire bars.

The constituents of the new substance are,

kaolin, magnesia, bauxite, iron filings, and sand, together with thewater necessary to make a plastic or pulpy mass. For the sand it is bestto use refractory polishing sand.

The proportion of the constituents is preferably the following: kaolin50%, magnesia 20%, bauxite 10%, iron filings 10% and sand 10%.

The following process is suggested for the production of the newmaterial, and for the manufacture of' articles from the same. Theconstituents, kaolin, magnesia, and bauxiteare first of all separatelytreated. The kaolin is allowed to soften for two or three hours inwater, the bauxite and the magnesia are powdered, the bauxite after ithas been previously burned, and these constituents also are then mixedwith water and allowed to stand for two or three hours before beingfurther treated. -A mixture is next made from the constituents treatedas above mentioned, with iron filings and sand, which mixture is allowedto stand for at least 24 hours, and it is then ready to be molded intothe fire roof articles required. In order to facilltate the molding,

Specification of Letters Patent.

Patented Mar. 8, 1910.

Application filed September 25, 1909. Serial No. 518,495.

evaporates in the meantime can be easily re-.

placed.

It is to be especially noticed that the times given for each step of theprocess are minimum periods. A greater period favorably influences thequality of the product.

That I claim is:

1. A refractory substance, consisting of a' mixture of kaolin, magnesiabauxite, iron filings and sand. 2. A process for the production of arefractory substance consisting in treating kaolin, powdered burnedbauxite, and powdered magnesia separately for at least two to threehours with water, whereupon a mixture is made of the above mentionedconstituents with iron filings and sand, which mixture is allowed tostand for at least twenty four hours before further use.

3. A process for the manufacture of fireproof articles consisting inmolding the articles from a mixture of kaolin, magnesia, bauxite, ironfilings and sand, and burning them, after drying for at least 30 hoursat a temperature of from 800 centigrade to 900 centigrade.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRIEDRICH- GROSSMANN.

Witnesses:

R. BADEWiG, LOUIS VANDORF.

